System for establishing connection within a main exchange with one of a plurality of private branch exchanges



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SYSTEM FOR ESTABLISHING CONNECTION WITHIN A MAIN ONE OF A PLURALITY 0F EXCHANGE WITH PRIVATE BRANCH EXCHANGES 1944 18 She'ebS-Sheet l Original Filed Feb. 5

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G. DEAKIN Dec. 6, 1949 2,490,036 SYSTEM FOR ESTABLISHING CONNECTION WITHIN A MAIN EXCHANGE WITH ONE OF A PLURALITY OF PRIVATE BRANCH EXCHANGES Original Fil'ed Feb. 5, 1944 18 Sheets-Sheet 16 Dec. 6, 1949 G. DEAKIN 2,490,036

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GER/ILD DEH/(IN Dec. 6, 1949 Original Trama/w55 G. DEAKIN SYSTEM FOR ESTABLISHING CONNECTION WITHIN A MAIN EXCHANGE WITH ONE OF A PLURALITY OF PRIVATE BRANCH EXCHANGES Filed Feb. 5, 1944 18 Sheets-Sheet 18 PBX CENTR/4L OFF/CE WE YU nu um A N N F Msi/P05. "7

Patented Dec. 6, 1,949

SYSTEMEFOR'; ESTABLISHING CONNECTION WITHIN''MAINJ'EXCHANGE WITH ON'EOF APLURALITY OF BRIViAfDEiBR'ANUH CHANGES Gerald' Deakin.. Nevg York, Ni' Y., assigner tojl'r'i`A ternational Standard Electric Corporation; New York, .NJ Y', acorporationf-dfDelaware-l Original 4applicationI `eruary 5, 1944, Serial No..

521,160'.' Dividedand this application October 6,-l945;,,Ser-ailfN'o.620,836.A v

(CII ngi-27)' This: invention` relates to.v new and usefulirnprovements inautomatictelephone systems. The

present is a division ofmy copending-application.l

SerialA No. 521.160,.. led.- February,A 5,1944;` now Patent-No.l 2,484,080, issued; Oct; 111949. v

In the system of the .-presentiinvention. when aP: A: B. X` number isdiaIed,` the. mainexchange registerf isf disconnected,... and the calling sub-A scriber: is connected with Va. P..A..B. X` attendants position who then completes the, localconnec tion.; However..y if the cal-lingv sislbscriher.v dials aispecial- P. A.` B; X' number. then instead. of.

being connected-.via .the attendant he may dial thee number ofx thea local P.. A.. B.- X subscriber, the.. register controller. at the mai-n1 exchange remaining. attached tot thev connection-- for this.

with'the .d'etails' oftheemannerlinwhichf P..A.-B. X. switching;isfcontrolled willfmore clearly appear from the followingf.detailed;description` andthe.

appended claims:

Asfmuch i of.. a.: multi-office 1 system will be; def scribed as is necessary or'a clearundersta-nding of the-inventionwY While a telephoneffsystexnel of the so-called.: multi-potential selection: typer will l befdisclosed;1 .itz-will befclear to. those` skilledini` the art that some of the features-araapplicablefto many. other.r types.y of switching-systems;.whether they arefA usedl for' establishing. telephone.. con-A nections or. for. any.v other.: purposes;-

Inthe drawings:

Fig; 1 isaa' block'- diagramy showing; af general' lay-out of.thesystem;

Figs. 2a to 2e illustrate the various selectorfcircuits;

Eig; 3. showsny arr ail-purposel selector?V circuit which may; be f adjusted for'. various? purposesl inf the manner indicated in`1Fi'gf..3;

Fig., 4. shows a subscriber's line. circuit;

Fig. 5,- an 'Rlink' start and' chooser circuit;

Fig. 6, an -`lit-dink;

Fig..8',fthe..terminal bank of atflnal selector;

Eiga. 9', mtv-uniti;

Figs. 10, .10a.iand.t.10b, a register;

Fig. 11, a two-digit translator link;

Fig.; 12., attivo-digit` translator: bank;

Fig. 13, a three-digit translator link;

Fig; 14, ,ab threeedi'gitttranslator bank-v;

Fig: 16; a"local"trunk` to' arioper'ator Fig. 1'7, an outtru'nl* circuit? v Fig. 18, the tens positioniofal'nalselector bank;

Figa 209 ai'busy tonefcircuitl- Thei following.' are definitions Aofi' some:x of.- theI expressions usediinitllieespecication and..claims:.

Multifpotentialt working; or operation` .meansy aselectiveoperation in which. a numerical'or non` numerical switch,.such-asaseleotor vor-linefnder, is stopped. underthecontrolioiA a device, e. g. anelectrical.` discharge tube provided inai registerl controller when. a certain.. predetermined rela` tionslip existsbetween two potentials simultaneously applied` to said device. O`ne of said potentials-Liseapplied! in-- accorda-nce'with `the numerical` or somefother designation or.: characteristic. ot the4 line. to.y be: selected,... andl the other potential :under f the: control of the.y numerical or non-numerical Yswitch during its.. operation.Y

B-link? designates arlink: extending between`v the Wipers of a-l-line nderandfa rst selector; R-link is. al linlrl by means:- ofwhich a register' may be@ associated withta B`link-.;.T-link isv a link. by meansA of Which anincoming trunkfat an exchange -isflinkedto =the.Wipers-.fof=-onez ofi-the group selectors; 'I'R-linkf? isf'aalinkSbyfmeanstotV which` aregister-is connected.A to afT-link;A A- register iswaragister` controller by; means-or which the establishment# of: callsi originating.z within the exchange is controlled;4 T-register. isa register#controllerV by meanszof which af-c'all which originatedeoutside:ot--thei exchange-is Ycontrolled: within@ the.r exchangetin. which` the Tf register' isflo'cated; Finalf means-l the final selectorfv or. connector means-of. which the called line: is seized;4

For!l the sake of brevity; theWords1vcontact and.xre1ay willynotbe'zrepeated when reference i'szmade. to-.the f fronti or backcontactl of a. relay. Thus: back BER?? means the back contact` of relay BER.

l IT'HESELEGTIONCIRCUIT The` switchingfmechanism isxa-high. speed;` tube controlled;.foursl brushs selector! adapted; to hunt overl a single. unsplit'banltiof the. typel-disel0sedf inPaten'tiNoil 2g336i47f1 issued Decemberi 14, 1945', and Patenti-No..235330,812eissued October 5.2 19113.*l 'The'.unspltbahkllisf madefpos'sible fb'y the. multi-- potentiali. seleetl'onl ari-angement here used aridi fully described in Patent No. 2,351,016 issued June 13, 1944, Patent No. 2,380,950 issued August '7, 1945, led August 28, 1943, the patent of H. F. Herbig, No. 2,354,682 issued August 1, 1944, and the applications referred to in said patents and application. The nders and selectors are arranged in the manner shown on the junction diagram of Fig. 1.

As distinguished from my Patent No. 2,380,950 where three types of switching selector circuits are used, in the present system, all switching selector circuits are identical. Each has two relays, AR and BR, as shown in Figs. 2a-2f, 3 andv 3a. This circuit by simple strapping and, when necessary, by cutting in relay links may be used for the following purposes: y

2nd une lnder, Fig 2b .Used with a B-unk 1st group selector, Fig. 2b (Fig. 7) forms the 1st line finder, Fig. 2c usual connection Local group and penultimate selectors, Fig. 2a Final selector,Fig. 2d, used with F-link (Fig. 9) Incoming trunk selector, Fig. 2e Special service group selector, Fig. 2c Tandem selector, Fig. 2e

The intra-office trunks have four Wires and the lnter-oiice trunks two wires. The a and b wires are the talking conductors, the c wire the holding wire and the t wire the test wire which, during selection is used for testing but is freed after selection for miscellaneous use, such as calling line identification, multiple metering, automatic ticketing, service identification, etc. The test wire even provides the facility whereby the exchange attendant may identify the number of the calling subscriber without going to the trouble of tracing down the connection.

REGISTER CONTROL WITH TRANSLATION The system is register controlled. The register in the originating ofice-the so-called A- register-is connected to 31inks (Fig. 1) through R-links. The R-links contain the equipment for handling the requirements of ringing, busy calls. metering, coin machines and other similar functions. For large areas where translation is necessary, translator links are associated with .the register. Where mixed two and three-digit ofce prefixes are used, two and three-digit translators are also used. Each translator link has a regis-- ter iinder and translator nder. The banks of the translator finders are multipled, and one cross-connection for each oce prefix suiiices rfor all translators.

The trunks incoming from other oiiices (Fig. 1) terminate in groups of relays-designated as T- links-which are cross-connected to standard all purpose switching selector circuits. The registers which handle incoming calls-the so-called T- registers-are connected to the T-llnks through TR-links, corresponding to the R-links used with the A-registers. The possibility of cross-connecting and of using any group selector for local or incoming connections is a great convenience in a growing and changing network.

Adding translation to unsplit selector banks such as are used in the present system, greatly increases the efficiency of the trunk plan in large networks. Selections may be suppressed or bypassed, for example, from the second group selectors to the penultimate selector for handling heavy local traine. This is indicated by dotted lines in Fig. 1. Trunks may be routed ln any convenient manner and not according to a xed numerical designation as is necessary in systems without translation. Additional selections may be introduced to provide for large group concentrations for the more economical use of long and important loaded trunks, et'c.

The translator controls the re-routing of calls and is automatically connected with the register depending on the number dialed. After it had performed its function, the translator is disconnected from the register.

REGISTER RELAYS (TOTAL 37) An explanation of the functions of the various relays will be helpful in tracing the circuits of the register. The relays may be divided into the following four groups:

(a) Register proper (18 relays, Figs. 10, 10a) DR-dialing relay. Follows dial impulses.

RIR-slow release relay. Does not fall off during pulsing.

RZR-slow releasing change-over relay. Does not fall oif during pulses but only when the circuit is opened between the dialing of digits when DR comes to rest on its front contact.

RAR-operates when the register is picked up and adapts the register to select the rst line finder and the calling line.

RBB-operates when the calling line is picked up by the rst line finder and releases RAR.

RCR-multi-contact relay to provide ground holding contacts.

RDR-operates when 'the rst pulse is received and transfers the grid of VlB from the calling line potential PC to the busy potential PB thus adapting the register to control the selectors.

RER-disconnects the identifying service class potential PS when dialing commences and in place thereof connects potential PJ to the grid of VIA.

RFR-low resistance relay in series with the a wire. Operates when the selector is hunting.

RGR-a slightly slow releasing relay. Operated by RFR and when operated, connects the grid of VIA to the PN or PT potential and, when on its back contact, to potential PJ. This relay always makes its back contacts before relay GSRI breaks its front contacts.

RLR-operates when the units are being selected. Prepares register for release or change to in-dialing to P. B. X.

RPR- operates when tens are being dialed to remove potential PB from the grid of VIB.

XR-multi-contact relay. Restores switches to normal.

GVR-high speed relays. Operated by gas valves. Speed in breaking relatively heavy current at back contact essential requirement.

GSR-slow releasing relay. vOperated by GVR. Used to establish condition necessary for changeover from one selection to the next or for release.

HTBR-connects the high tension plate bat-- tery of volts to one electrode of the vgas valves GVI and GVZ and to one side of the windings of relays GVRI and GVRZ.

(b) Translator um't (6 relays, Fig. 10b) RTRl-connects two-digit translator link to register when any rst digit 2 to 7 is dialed. RTRZ-connects three-digit translator link when two-digit translator link finds the rst two digits dialed from vpart of a three-digit oice prex. v

RTRB-starts selection when the translation is complete.

RTRll--reduces ofiice pre'x selection to three.

digit 

